160 DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



Distillate-oil emulsions at 6 per cent strength and crude-oil emul- 

 sion at 12 per cent strength, measured by their efficiency against 

 scales and lichens, convenience of preparation and application, and 

 cost, are the sprays best adapted for the European fruit Lecanium 

 and the European pear scale. 



The 6 per cent distillate-oil emulsion will cost about 2^ cents for 

 each prune tree and 3J cents for each apricot tree. 



The 12 per cent crude-oil emulsion will cost about 2 cents for each 

 prune tree and 2J cents for each apricot tree. 



All sprays, to insure the best results, should be applied with a 

 power outfit at a high pressure (180 to 200 pounds). A coarse, 

 drenching spray applied with crook nozzles is preferable, and Feb- 

 ruary is the best month in which to spray. 



